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Divestitures - Additional Information (Details)
¥ in Thousands, $ in Thousands
1 Months Ended 12 Months Ended
Aug. 31, 2023
CNY (¥)
Aug. 31, 2023
USD ($)
Sep. 30, 2023
CNY (¥)
Sep. 30, 2019
Sep. 30, 2022
CNY (¥)
Sep. 30, 2022
USD ($)
Divestitures            
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal, Statement of Income or Comprehensive Income [Extensible Enumeration]     Other Nonoperating Income (Expense)      
Beijing Origin            
Divestitures            
Ownership percentage by VEI subsidiary (as a percent)       49.00%    
Beijing Changping Technology Development Co. Ltd.("BC-TID") | Beijing Origin            
Divestitures            
Percentage of Ownership 51.00% 51.00%   51.00%    
Ownership percentage by VEI subsidiary (as a percent) 48.27% 48.27%        
Equity investments         ¥ 137,700 $ 20,200
Beijing Changping Technology Development Co. Ltd.("BC-TID") | Disposal Group            
Divestitures            
Recognized disposal gain ¥ 40,740 $ 5,670 ¥ 40,741      
Gain attributable to disposal group ¥ 28,790 $ 4,010 ¥ 28,788      
Beijing Changping Technology Development Co. Ltd.("BC-TID") | Beijing Changping Technology Development Co. Ltd.("BC-TID")            
Divestitures            
Equity method investment ownership percentage 48.27% 48.27%